Ian, all previous posts are good advice. I remove my Status dish and pull the lead out through the roof. May be a good idea to attach a bit of thin string to it before you do so, then leave the string running from the top down into the locker. when you come to re-install, just tape the lead to the "top" end off the string and pull it back through.
Also, if you havn't got the makers plug, then you will find the childproof cap from a bottle of Boots asprin / codience tablets is a good fit over the top. Add a bit of a silicone sealer inside the cap before fitting and you will have a completely waterproof job. The biggest fiddle is re-fitting the coax plug to the downlead when you re-install, although you will be able to do this correctly, unlike many dealers and manufacturers.